Update doc for r368222: url/title field requires "tabs" permission to be     effective in chrome.tabs.query.
Update doc for r368222: url/title field requires "tabs" permission to be
    effective in chrome.tabs.query.

BUG=572545
Test=Manually using ./preview.py

Review URL: https://codereview.chromium.org/1576433002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368462}

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